What time is it in Sydney when it's 9 AM in Buenos Aires?

11:00 PM — as of 6 October 2026. Sydney is 14 hours ahead of Buenos Aires.

What's the best time for a call between Buenos Aires and Sydney?

There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 19:00 in Buenos Aires (09:00 in Sydney).

What time zones are Buenos Aires and Sydney in?

Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today); Sydney uses Australia/Sydney (UTC+11 today).

Time difference between Buenos Aires and Sydney

Sydney is 14 hours ahead of Buenos Aires. When it's 9:00 in Buenos Aires, it's 23:00 in Sydney.

From

Sydney is 14 hours ahead of Buenos Aires.

On Tuesday, 6 October 2026, 09:00 in Buenos Aires is 23:00 in Sydney. Buenos Aires is UTC−3; Sydney is UTC+11.

The gap through 2026

1 Jan – 4 AprSydney is 14 hours ahead of Buenos Aires.
4 Apr – 3 OctSydney is 13 hours ahead of Buenos Aires.
3 Oct – 31 DecSydney is 14 hours ahead of Buenos Aires.

Sydney moves its clocks back on 4 April (UTC+11 → UTC+10).
Sydney moves its clocks forward on 3 October (UTC+10 → UTC+11).

Buenos Aires to Sydney, hour by hour

On Tuesday 6 October.

Buenos Aires	Sydney
07:00 Early morning	21:00 Evening
08:00 Early morning	22:00 Sleeping hours
09:00 Working hours	23:00 Sleeping hours
10:00 Working hours	00:00+1 Sleeping hours
11:00 Working hours	01:00+1 Sleeping hours
12:00 Working hours	02:00+1 Sleeping hours
13:00 Working hours	03:00+1 Sleeping hours
14:00 Working hours	04:00+1 Sleeping hours
15:00 Working hours	05:00+1 Sleeping hours
16:00 Working hours	06:00+1 Sleeping hours
17:00 Evening	07:00+1 Early morning
18:00 Evening	08:00+1 Early morning
19:00 Evening	09:00+1 Working hours
20:00 Evening	10:00+1 Working hours
21:00 Evening	11:00+1 Working hours
22:00 Sleeping hours	12:00+1 Working hours

Daylight saving in 2026

Sydney moves its clocks back on Saturday 4 April (UTC+11 → UTC+10).
Sydney moves its clocks forward on Saturday 3 October (UTC+10 → UTC+11).

1 Jan – 4 AprSydney is 14 hours ahead of Buenos Aires.
4 Apr – 3 OctSydney is 13 hours ahead of Buenos Aires.
3 Oct – 31 DecSydney is 14 hours ahead of Buenos Aires.

Best times for a call

Working hours (09:00–17:00) in Buenos Aires and Sydney don't overlap, so any call is early or late for someone.

Buenos Aires 19:00EveningSydney 09:00 +1Working hours
Buenos Aires 20:00EveningSydney 10:00 +1Working hours
Buenos Aires 21:00EveningSydney 11:00 +1Working hours

How the time difference calculator works

The difference is each city's offset from UTC on the date you pick, subtracted. Offsets come from the IANA time zone database in your browser.

Because countries change their clocks on different dates — or not at all — the gap between two cities can change for a few weeks a year. The calculator lists every change in the year.

Examples

London is 5 hours ahead of New York for most of the year, but only 4 hours ahead for about three weeks in March and one week in late October.
Dubai doesn't change its clocks, so its gap to London is 4 hours in winter and 3 hours in summer.

Good for

Knowing when a colleague's day starts
Setting expectations for replies across time zones
Planning travel and jet lag

Frequently asked questions

What time is it in Sydney when it's 9 AM in Buenos Aires?: 11:00 PM — as of 6 October 2026. Sydney is 14 hours ahead of Buenos Aires.
Does the time difference between Buenos Aires and Sydney change?: Yes. In 2026 it's 14 hours or 13 hours, depending on the date, because only Sydney changes its clocks.
What's the best time for a call between Buenos Aires and Sydney?: There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 19:00 in Buenos Aires (09:00 in Sydney).
What time zones are Buenos Aires and Sydney in?: Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today); Sydney uses Australia/Sydney (UTC+11 today).

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